Chao Ong Long (also spelled Ong Lông; Lao: ເຈົ້າອົງລອງ; died 1760) was the king of Vientiane from 1735 to 1760.
[1] Ong Long was the eldest son of Setthathirath II (Sai Ong Hue),[1] other source stated that he was a half-brother of Sai Ong Hue.
[2] He succeeded Sai Ong Hue in 1730.
Little is known about his reign.
He died in 1760 or 1767, succeeded by his son[1][2] (or younger brother[citation needed]) Siribunnyasan (Ong Boun).